共电式电话交换机
common battery telephone exchange
common battery private branch exchange
人公共电式交换总机
manual common battery switchboard
机电式交换设备
electromechanic switching equipment
公共交换电话网
public switched telephone networks
PSTN
公共交换电话网路
PSTN
public switched telephone network
共电交换台
common-battery switchboard
共电式电话机
common-battery telephone set
common-battery (telephone) set
common battery telephone
collective-electric telephone
程控交换机电路
Programmable switchboard circuit
地面航空无线电交换机
ground aviation radio exchange
机电交换系统
electromechanical switching system
交换式电源供给器
power suppliew， switching
switching power suppliew
power suppliew
switching
立式电机机座
the base of the vertical motor